Article of footwear



FIG. 1 is a top perspective view of our ornamental design of an article of footwear;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof; and,

FIG. 5 is a bottom plan view thereof.

The small dash-dash-dash broken lines shown on the strap of the shoe represent stitching. All other broken lines represent portions of the design that are no part of the claim. 

The ornamental design of an article of footwear, as shown and described. 